Mystery man claims winning Powerball ticket ... in Maryland?

A man at a gas station in Maryland was caught on camera reacting with excitement to a scan of his Powerball ticket, purchased in Arizona. NBC's Tom Costello speaks to the store clerk who checked the man's numbers, and claims he's the mystery co-winner of the $580 million jackpot.

By Jason White, NBC News

Officials say the winning tickets for the largest Powerball jackpot ever -- $587 million -- were sold in Missouri and Arizona. But on Thursday, a mystery man showed up at a gas station in Upper Marlboro, Md., claiming to hold one of the big winners.

Surveillance video showed the man -- burly, bald, African-American and clad in a yellow construction suit -- slowly amble up to the counter, where he pulled out some lottery tickets.

He showed them to the clerk and then repeatedly pumped his arms in excitement after reportedly seeing the numbers match.

According to Kamran Afgan, a cashier on duty at the time, the man said something along the lines of, "Oh my God," after his numbers matched, and gave Afgan the ticket to hold and examine.

Afgan said the man told him he was from Maryland and a member of the military. It's unclear if he's based in Arizona, but his ticket was an Arizona ticket, Afgan told NBC News. Afgan said he didn't get a chance to scan the ticket into the lottery machine because the man took it back so quickly.

The entire store was in shock, Afgan said.

Before leaving, the man showed his tickets to two other people in the store who confirmed he had the winner. At that point, the man walked out. But a moment later, he returned, saying he forget to buy gas.

One can understand how he might have been a little distracted.

No winner has come forward yet in Arizona, which means it is possible this Maryland mystery man holds a ticket worth $293.7 million in his hands.

"I called my husband and told him, 'I think I am having a heart attack,'" Cindy Hill, 51, said, according to a Missouri Lottery press release. "I think we just won the lottery!"

She added, "You know it's the Show Me State, so he said, 'Show me.'"

NBC News' Cydney Weiner contributed to this report.

NBC's Kerry Sanders reports from Dearborn, Mo., where the town is celebrating one family's luck of winning half the record Powerball jackpot. A family friend of the couple, expected to be named by lottery officials Friday, tells TODAY's Savannah Guthrie "it couldn't have happened to a better guy."